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I posted this same topic on the Piano Forum but I felt I should also get advice from piano technicians. This is what I posted:

I live in an area where termite infestation is a common occurrence. Some years ago, I had an upright which had its back against the wall. One day, I moved it away from the wall. On visual inspection, the piano's soundboard, ribs, and frame seemed all right. But then I poked the soundboard with my forefinger and to may dismay found out that there was only a thin outer layer. It was hollow underneath -- the work of termites.

I don't have that upright anymore and have since just very recently upgraded to a grand. I am afraid termites will leave their signature on my new grand.

Does anyone here have the same problem? Any advice on what to do to prevent termites attacking the piano?

Best to take a proactive approach and put liquid termiticide around the home. They have really good toxin laden bait traps now also you can put near your foundation. Termites carry the toxin back to the colony and it kills them. Remove any dead wood or stumps near the property that attracts them from elsewhere. Most termites are subterranean and need moisture around them to survive. Try keeping the humidity down and seal any openings/cracks in the foundation. Having the piano on a main or upper floor would help. A raw peice of sacrificial wood near the piano is a good early indicator of how effective this proactive approach is working. I can't comment on the kerosene castor cups but I would think there would be an associated odor around the piano from that.